I have a feeling there must be a simple answer to this, but I have googled without success. I've had this phone over a year, and another HTC phone before that, but I've never seen this before.
As it says in the title, the email icon at the bottom of my home screen has turned red. Not just a red marker - the whole envelope is red. It's also in the open position, ie open envelope with a letter sticking out the top (also with redlines on it). I've checked my apps drawer, and the icon in there is the same.
I have tried deleting all my emails (not a problem, because I am set up to receive emails temporarily in the phone, which later transfer to my PC). Also rebooted device.
It's an M9 running Android 6.0 and Sense 7.0. Service provider is Virgin UK.
As it says in the title, the email icon at the bottom of my home screen has turned red. Not just a red marker - the whole envelope is red. It's also in the open position, ie open envelope with a letter sticking out the top (also with redlines on it). I've checked my apps drawer, and the icon in there is the same.
I have tried deleting all my emails (not a problem, because I am set up to receive emails temporarily in the phone, which later transfer to my PC). Also rebooted device.
It's an M9 running Android 6.0 and Sense 7.0. Service provider is Virgin UK.

, just before the last couple of updates the Mail app locked up on me. 'Force stop' and 'cache clear' didn't resolve it so I had to resort to uninstalling updates which removed all accounts.
